Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of uteri from mice treated with 17beta-estradiol for different durations to study the molecular mechanism for estrogen induced uterine growth.

ABSTRACT: Immature (19/20 days of age) Alpk:APfCD-1 mice were treated with arachis oil (AO) vehicle or 0.4mg/kg 17beta-estradiol (E2), via a single subcutaneous injection, and sacrificed at 1hr, 2hr, 4hr, 8hr, 24hr, 48hr, 72hr post dose.

ORGANISM(S): Mus musculus

SUBMITTER: Fei Ling Lim

PROVIDER: E-GEOD-2195 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Phenotypic anchoring of gene expression changes during estrogen-induced uterine growth.

Moggs Jonathan G JG Tinwell Helen H Spurway Tracey T Chang Hur-Song HS Pate Ian I Lim Fei Ling FL Moore David J DJ Soames Anthony A Stuckey Ruth R Currie Richard R Zhu Tong T Kimber Ian I Ashby John J Orphanides George G

Environmental health perspectives 20041101 16

A major challenge in the emerging field of toxicogenomics is to define the relationships between chemically induced changes in gene expression and alterations in conventional toxicologic parameters such as clinical chemistry and histopathology. We have explored these relationships in detail using the rodent uterotrophic assay as a model system. Gene expression levels, uterine weights, and histologic parameters were analyzed 1, 2, 4, 8, 24, 48, and 72 hr after exposure to the reference physiologi ...[more]

PMID: 15598610

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Project description:Ascorbate (vitamin C) is an important antioxidant in leaves with multiple functions in photosynthesis and its levels are tightly regulated by light quality. The majority of work to date has focussed on regulation of ascorbate levels via biosynthesis. However, the pathway of ascorbate degradation, which is localised in the apoplast may additionally play a significant role. The degradative pathway begins with ascorbate oxidation by the enzyme ascorbate oxidase (AO) and hence we have examined the impact of manipulation of ascorbate oxidase activity on the content of ascorbate and the acclimation of photosynthesis to changing light levels. Leaf ascorbate content was highly light dependent in Nicotiana tobaccum being double in high compared with low light conditions. In contrast ascorbate oxidase activity was not altered by changing light levels. Transgenic tobacco lines with reduced or enhanced AO activity exhibited no morphological phenotype and photosynthesis under high light was similarly impaired irrespective of the measured AO activity. However further investigation between AO activity and leaf acclimation to changing light intensity revealed a suite of metabolic and transcriptome changes indicating a role for the apoplastic ascorbate pool in chloroplast to nucleus communication. In all genotypes, transcripts associated with ascorbate synthesis and recycling were less abundant following transition from high to low light. However transcripts associated with glutathione recycling, light harvesting, reaction centre function and the Calvin cycle were all increased in abundance. Following the transition from high to low light increases in leaf threonate, an ascorbate degradation product, were proportional to AO activity. A number of chloroplast synthesised amino acids were significantly increased both during high light and following transfer back to LL for 12 h. Similarly, several primary carbohydrates and TCA intermediates were significantly enhanced following high light treatment. In addition to light effects, AO activity had a significant impact on ï¢-alanine, aspartate and threonine. Intriguingly, a large number of fatty acids were reduced in antisense AO and wild-type plants immediately after high light stress however the content of these compounds were significantly increased in overexpressing sense lines. We conclude that AO mediated turnover plays an important role in adjusting cellular ascorbate content to photosynthetic need in a fluctuating light environment and that light mediated signals rapidly adjust that the apoplastic ascorbate pool.

Dataset Information

Transcription profiling of uteri from mice treated with 17beta-estradiol for different durations to study the molecular mechanism for estrogen induced uterine growth.

Publications

Phenotypic anchoring of gene expression changes during estrogen-induced uterine growth.

Similar Datasets

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